I've run into this as well, as near as I can tell part of the problem stems from the way objects are imported. For example I model a lot of stuff in lightwave and 3ds max. These programs always seem to flip or swap the X,Y,Z coordinates when the object is brought into Bryce. Sometimes I just have to find the best match. For instance you might try setting the texture to map in a cyclindical fashion that way only the tops and bottoms of the object are messed up. Then you can hide the mistakes with whatever is handy. This may or may not work...hope it helps at least.